Use a JSON Transformation Step to transform JSON data from one format to another using the JSONata transformation language.

Note: JSONata syntax reference is outside of the scope of this document, but is extensively covered elsewhere.

JSONata expressions reference previous step outputs in the same format as Flow expressions (for example some_attribute on the output of the first user-defined step):

{{%step[0].output.attribute%}}

JSONata also has handy utility functions to, for instance, perform complex operations on strings, arrays, etc.